______ is particularly important becuase it provides us with defense against invaders we have already encountered

memory

We can "train" our immune response throught the use of ______, which expose us to foreign agents without illness setting in.

vaccines

A foreign material which triggers an immune response?

antigen

Antigens can be any ____ or ____.

1) protein2) many polysaccharides

_______ are responsible for tackling antigens head on and they do so by differentiating themselves to match specific antigens.

B-cells

Some B-cells will differentiate into _____ that form _____ .

1) plasma cells2) antibodies

__________ match up with antigens and inactivate the foreign cells thus providing immunity.

Antibodies

The T-cells are more diverse and come in 3 forms:

1) Cytotoxic T-cells2) Helper T-cells3) Suppressor T-celss

Directly attack virus infected tissue cells

CytotoxicT-cells

Activate B-cells and cytotoxic T-cells

Helper T-cells

Can inhibit the immune response

Suppressor T-cells

Since T-cells act more directly on body tissues they are said to initiate ________.

cellular immunity

What are the 2 major functions of lymph nodes:

1) production of lymphocytes2) Filters lymph that runs through the network of vessels

What are 2 functions of the spleen?

1) Removal of abnormal blood cells and other blood components by phagocytosis2) the storage iron recycled for red blood cells3) The iniation of immune responses by B-cells and T-cells in response to antigens in circulating blood

What is the function of tonsils?

1) trap bacteria and viruses which you breathe in2) have antibodies and immune cells that help to kill germs and prevent lung and throat infection

What are the structural similarities found in lymph nodes, spleen and tonsils?

1) they have a capsule2) they are rounded organs with an internal parenchyma of lymphoid cells